Academic Year 2016- 2017
Third Term
Science Revision sheets
SCIENCE
Name: ______Date: ______
Grade:6 Section: ______
Q1: Choose the letter of the choice that best answer the questions:
1. How can the speed of a mechanical wave be calculated? A. Add the wavelength and the period. B. Divide the period by the wavelength. C. Divide the wavelength by the period. D. Multiply the wavelength and the period.
2. What is one way that electromagnetic waves differ from mechanical waves? A. Electromagnetic waves move slower. B. Electromagnetic waves are longitudinal. C. Electromagnetic waves can travel through empty space. D. There is no difference between electromagnetic and mechanical waves.
3. What is the name of the lowest point of a wave? A. crest B. trough C. amplitude D. rest position
4. Astronomers study radio waves to learn about the universe. Why might radio waves be used to study objects in space? lesson quiz
A. They are sound waves that cause vibrations in stars and planets. B. They are electromagnetic waves, so they don’t require a medium. C. They are mechanical waves that pass through interstellar particles. D. They are longitudinal waves, which create compressions in the fabric of space.
5. Which is the best description of a wave? A. energy that makes particles move B. a disturbance that transfers energy C. a disruption causing the transfer of matter D. any type of matter that vibrates back and forth
6. A wave produced by an earthquake appears in the diagram below:
A second wave leaves the center of an earthquake at the same time. The second wave is a longitudinal wave. After 10 seconds, will the two waves travel the same distance? A. Yes, because both waves are longitudinal waves. B. Yes, because all waves travel at the same speed in similar mediums. C. No, because only one type of wave can travel through a medium at a time. D. No, because transverse waves travel at different speeds than longitudinal waves.
7. A whale makes a noise underwater that is too low-pitched for humans to hear. What type of wave is this? A. S wave B. visible light C. mechanical D. electromagnetic
8. The speed of a mechanical wave through lesson 2 a medium depends on the type of medium. It also depends on the type of mechanical wave. Which statement is true? A. All waves travel at the same speed through any medium. B. All waves travel at the same speed if no medium is present. C. Electromagnetic waves require a medium, but mechanical waves do not. D. Mechanical waves require a medium, but electromagnetic waves do not.
9. The diagram below shows a wave pattern. One wave property that is shown is amplitude. Amplitude is the vertical distance from the rest position to either the crest or the trough of a wave.
What is the rest position of a wave in the diagram? A. E B. F C. distance from G to H D. point that is halfway between G and H
10. Brianna reported a measurement in units of hertz. What property of a wave was she measuring? A. period B. frequency C. amplitude D. wavelength
11. During a thunderstorm, Sanjay saw lightning and then heard thunder 5 seconds later. What would be different if the air had been warmer? A. He would have seen the lightning and heard the thunder at the same time. B. He would have heard the thunder before seeing the lightning. C. He would have heard the thunder sooner.
D. He would have heard the thunder later.
12. Aimee and Patrick are playing hide-and-seek on a summer day. Aimee gives Patrick a clue to her location by knocking three times every 30 seconds. Which characteristic of waves makes this a useful clue to help Patrick find Aimee? A. Wave energy increases with distance. B. Wave energy decreases with distance. C. Sound waves travel faster in cold air than in warm air. D. Sound waves travel faster in warm air than in cold air.
13. Which statement best describes how humans hear sound? A. Sound waves enter the ear canal and increase in amplitude, which causes you to hear the sound. B. Sound waves cause parts of the ear to vibrate until the waves are converted to electrical signals, which are sent to the brain. C. Sound waves travel into people ears, and then the eardrum sends the sound waves to the brain. D. Sound waves become sounds when they strike the eardrum inside the ear.
14. When Consuelo struck a tuning fork and held it close to a string on a guitar, the string began to vibrate on its own and make a sound. Which statement best explains why the string vibrated without anyone touching it? A. The string vibrated because of destructive inference between its sound waves and those of the tuning fork. B. The tuning fork produced ultrasonic frequencies beyond human hearing. C. The tuning fork and the guitar string both created mechanical waves. D. The string vibrated because of resonance, which happened because the tuning fork and guitar string have the same natural frequency.
15. The diagram below shows a sound wave traveling through a medium.
Which statement best describes how the sound wave is moving through a medium? A. The sound wave is creating tensions and accumulations in the medium. B. The sound wave is creating an echo inside the medium. C. The sound wave is creating compressions and rarefactions in the medium. D. The sound wave is creating a mechanical wave in the medium.
16. Which material best absorbs sound waves in a room? A. heavy curtains B. brick walls C. hardwood floors D. cement floors
17. Yorgos drew a diagram of a wave and labeled its parts, as shown below.
Wavelength is typically measured between the crests to two successive waves. Which labels represent a crest and a wavelength? A. G points to a crest, F is a wavelength B. G points to a crest, E is a wavelength C. H points to a crest, E is a wavelength D. H points to a crest, F is a wavelength
18. Which of the following is not a way in which echolocation is used? A. flying bats avoiding trees and houses at night
B. sending messages over telephone lines C. dolphins finding fish in deep water D. mapping the ocean floor
19. Josh observed a bolt of lightning during a thunderstorm. It took more than 15 seconds for Josh to hear the sound of thunder. Why did Josh see the lightning strike before he heard the thunder? A. Thunder always takes 15 seconds to travel through the air after lightning strikes. B. Light waves from the lightning and sound waves from the thunder moved through different media. C. Light waves are electromagnetic waves that travel much faster than mechanical waves, such as the sound waves he heard as thunder. D. The conditions in the air at the time allowed light waves to move faster than the sound waves he heard as thunder.
20. The diagram below shows the distribution of particles in
two different kinds of media. Liquid Gas
Which statement best compares how sound waves travel through the media shown above? A. Sound waves travel at the same speed through both of the media shown. B. Sound waves move faster through the liquid medium on the left than the gaseous medium on the right. C. Sound waves move faster through the gaseous medium on the right than the liquid medium on the left. D. Sound waves cannot travel through either medium that is shown above.
21. Suppose a mechanical wave is traveling through medium A. When the wave enters medium B, it speeds up. Which of the following statements can be true about medium A and medium B? A. Medium A is a solid and medium B is a gas. B. Medium A is a liquid and medium B is a solid. C. Medium A is a gas and medium B is a vacuum. D. Medium A is a vacuum and medium B is a liquid.
22. What is the term for the distance from the highest part of one wave to the highest part of the next wave? A. period B. frequency C. amplitude D. wavelength
23. Caleb is at the beach. He counts the number of wave peaks that pass a given point on the beach in a certain amount of time. What property of waves does Caleb measure? A. speed B. frequency C. amplitude D. wavelength
24. Carlos is studying electromagnetic waves. He finds a diagram
of the electromagnetic spectrum shown below, but it is missing a label. What is the proper label of the unlabeled region?
A. radar B. television C. visible light D. cosmic rays
25. An earthquake sends out mechanical waves in all directions from its source. In answering the following question, assume the wave starts
carrying energy equally in all directions. The wavefront reaches each of the different locations as shown in the diagram. At which location does a point on the wavefront have the least energy? A. 1 B. 2 C. 3 D. 4
26. In which direction do longitudinal waves travel? A. They travel in random directions. B. They travel around in a circular motion. C. They travel parallel to the direction of the disturbance. D. They travel perpendicular to the direction of the disturbance.
27. Through which medium does a mechanical wave travel most quickly? A. solid B. liquid C. less dense gas D. very dense gas 28. What is the speed of a wave with a wavelength of 4 cm and a frequency of 8 hertz? A. 0.5 cm/s B. 2 cm/s C. 12 cm/s D. 32 cm/s
29. A wave passes through a medium. The particles in the medium change their position. Which statement best describes how the position of a particle changes as the wave progresses? A. The particle moves in one direction, then the opposite, and returns to its original position. B. The particle moves perpendicular to the direction of the wave into a new position C. The particle moves parallel with the direction of the wave into a new position. D. The particle vibrates continually around its original position.
30. The graph below shows the speeds of three different waves traveling in both air and water. What evidence suggests that wave II is a mechanical wave? A. Mechanical waves cannot pass through solids, which is why the data are missing. B. Mechanical waves do not travel faster than 5,000 m/s. C. Wave II lacks the amplitudes of wave I. D. Its speed differs depending on the medium. 31. All mechanical waves have which of the following in common? A. Mechanical waves are transverse. B. Mechanical waves are longitudinal. C. Mechanical waves do not require a medium to move. D. Mechanical waves must progress through a medium.
32. A loud motorcycle passes by the front of Bill’s house. What medium does the sound wave travel through to get from the motorcycle to Bill’s ears? A. air B. energy C. a vacuum D. large vibrations
Q2 Fill in the blanks
(longitudinal,mechanical,frequency,medium,amplitude,electromagnetic)
1. Light travels as an electromagnetic wave.
2. The maximum distance that the particles of medium move away from their rest position is a measure of a wave’s amplitude
3. Hertz is used to express frequency
4. Some of the wave’s energy stays in the medium
5. In a longitudinal wave ,the disturbance moves parallel to the direction the wave travels.
6. mechanical waves require a medium in which to travel.
Q3. Check the box to show whether each statement is true or false.
T F 1. A Sound wave is a longitudinal wave that is caused by vibrations in a medium. T
2. Decibels are units that measure the pitch of a sound. F 3. An echo is a sound wave that is absorbed by a soft material. F 4. Interference occurs when two or more waves overlap and combine to form one wave. T 5. Ultrasound technology is used to create medical images and it is based on sound waves with frequencies so high that human ears cannot hear them. T
Q4: Match each term in column (A) with its definition in column (B).
A B
1 Waveperiod The speed at which a wave travels through a medium. 2 2 Wavespeed The time required for one wavelength to pass a point.1
3 Mechanical waves Electromagnetic wave 4
4 firelight Vocal sound 3
5 Water waves Surface waves 5
6 hertz Frequency 6
7 Sun rays Empty space 8
8 Vacuum Mechanical wave 10
9 Wavelength Electromagnetic wave 7
10 Music A distance over which a waves shape repeat 9
Q 5. Answer the following questions in the space provided.
A. Describe where the cochlea is located, what parts it contains, and explain the role these parts play in human hearing.
1. cochlea is located in the inner ear; humans have two cochlea, one in each ear 2. The cochlea contains liquid, hair cells, and nerve cells. 3. Vibrations in the inner ear create waves in the liquid, which bend the hair cells and stimulate nerve cells to send electrical signals to the brain.
B. Suppose you are at a train station. What changes would you hear in the sound of the whistle as a train comes toward you and then moves away?
What causes the changes? 1. The sound of the train whistle grows to a higher pitch as the train comes closer then drops to a lower pitch as the train moves away 2. The change in pitch comes from the Doppler Effect.
C. Are the sun’s rays mechanical waves or electromagnetic waves? Give reason. Sun rays are electromagnetic waves because they travel through empty space to reach Earth.
D. What is a wavelength? The wavelength is the distance from any point on a wave to an identical point on the next wave
E. Describe a wave A wave is a disturbance that transfers energy from one place to another.
F. What is the difference between a longitudinal wave and a transvers
wave?
In a longitudinal wave, particles move parallel to the wave.
In a transverse wave, particles move perpendicular to the direction
the wave travels.
Q 6. Define the following
a. Amplitude
Amplitude is a measure of how far the particles in the medium
move away from their rest position.
b. Wave period
The wave period is the time required for one cycle. c. Frequency
The frequency of a wave tells how many cycles occur in an amount
of time. d. Wave speed
Wave speed is the speed at which a wave travels. e. Pitch
Pitch is how low or high you think a sound is. f. Loudness
Loudness is a measure of how well a sound can be heard. g. Ecolocation
Echolocation is the use of echoes or reflected sound waves to find
objects. h. Ultrasound
Ultrasounds are sound waves that have frequency greater than
20,000 Hz. i. Sonar
Sonar is a system that uses sound waves to determine the location
of objects or to communicate
Q 7. Complete the Venn diagrams to show the difference and similarities between mechanical waves and electromagnetic waves
Mechanical waves Electromagnetic waves
requires material medium Transfers energy Does not require material medium
Q 8. From the transverse wave below, identify amplitude, wavelength,
crest, and trough.
I
E = Amplitude
F = Wavelength
G = Crest
I = Trough
Q 9. What is SI unit of the quantities below?
Physical Quantity S.I Unit
Frequency hertz 1
wavelength Meters 2
Decibel 3 sound
4 Wave speed Meter per second